Developed for the AR-10 platform, as far as could be ascertained, it was developed around 2014. The 50 Krater is based on a shortened 300 RUM case. There was a mention of the 50 Krater on The Texas Hunting Forum and that a company called Outdoor Shooter Supplies loaded the 50 Krater on their Red Stag brand, however the website does not seem to be working at the moment.
